相关期刊:《International Journal of Agricultural and Biological Engineering》《Beijing Review》《Science China(Technological Sciences)》《Transactions of Nanjing University of Aeronautics and Astronautics》更多>>
Japan overtook China as the largest foreign holder of U.S. Treasury securities at the end of 2009 after China sold $34.2 billion in American securities last December. China had previously surpassed Japan as the larges...